What is this?

WATCH ABOVE: A picture of a dress appeared on Tumblr and a hot debate spread like wildfire across the Internet about dress’ colours. As Aarti Pole reports, this is a phenomenon advertisers and PR companies can only dream of.

Is the dress black and blue or is it gold and white?

Serious debate across social media was raging Thursday night as people vigorously argued the colour of a dress a woman posted to her Tumblr account.

The image was posted on by user Swiked on Wednesday with the caption “guys please help me – is this dress white and gold, or blue and black? Me and my friends can’t agree and we are freaking the f*** out.”

Now millions across the world are arguing as to what colours the dress is, with some claiming the colour of the dress changes every time they look. The Internet broke with the top two trends on Twitter being #TheDress and #TheDressWhiteAndGold.